compiler/testData/diagnostics/tests/controlFlowAnalysis/kt2226.kt

// FIR_IDENTICAL
//KT-2226 Parameter used as delegation by object marked as unused
package a

interface A {
    fun foo() : Int
}

class B : A {
    override fun foo() = 10
}
fun foo(b: B) : Int {
    val o = object : A by b {
    }
    return o.foo()
}